android - 如何清除回收站 View 中突出显示的项目？

Question

我已经通过在选择时更改项目的背景颜色来实现回收器 View 多个项目选择。当我从模型中删除这些项目时，项目被删除但突出显示不会随着项目的删除而消失，而是应用在剩余的项目上。

我已尝试从模型中移除项目并在每次移除时通知适配器，如下所示

  for (item in selectedItems) {
                        deleteResidentItem(item.key, sharedPreferences.getString("AuthToken", SHARED_PREFERENCE_DOES_NOT_EXIST))
                        removeSelectedItemsFromModelById(item.key)
                        residentRecyclerViewAdapter.notifyItemRemoved(item.value)
                        residentRecyclerViewAdapter.notifyItemRangeChanged(item.value, mutableResidentList.size)
                    }

即使删除项目后，突出显示的项目仍然随机出现在列表中，如下例

我希望高亮 View 在从模型中移除后消失，如何解决这个问题？

适配器实现代码

class ResidentRecyclerViewAdapter( val residentItems: List<ResidentListModel>):RecyclerView.Adapter<ResidentRecyclerViewAdapter.ResidentViewHolder>() {



    lateinit var residentRecyclerViewListenerInterface:ResidentRecyclerViewListenerInterface

    fun initResidentRecyclerViewListenerInterface(listener:ResidentRecyclerViewListenerInterface) {
        residentRecyclerViewListenerInterface = listener
    }

    override fun onCreateViewHolder(parent: ViewGroup, p1: Int): ResidentViewHolder {
        var layoutInflater = LayoutInflater.from(parent.context)
        var inflatedLayout = layoutInflater.inflate(R.layout.single_resident_item, parent, false)
        return ResidentViewHolder(inflatedLayout, residentRecyclerViewListenerInterface)
    }

    override fun getItemCount() = residentItems.size
    override fun onBindViewHolder(holder: ResidentViewHolder, posistion:Int) {
        //place to bind the values
        val ModelName = residentItems.get(posistion).ModelName
        val VechicleNo = residentItems.get(posistion).VehicleNo
        val SlNo = residentItems.get(posistion).SlNo
        holder.vehicle_number.text = VechicleNo
        holder.model_name.text = ModelName
        holder.sl_no.text = SlNo.toString()

        holder.resident_item_wrapper.setOnLongClickListener {

            when (holder.is_selected.isChecked) {
                // not checked, then check, add to list
                false-> {
                    holder.resident_item_wrapper.setBackgroundColor(Color.parseColor("#1565c0"))
                    holder.resident_vehicle_number.setTextColor(Color.WHITE)
                    holder.resident_model_name.setTextColor(Color.WHITE)
                    holder.is_selected.setBackgroundColor(Color.WHITE)
                    holder.is_selected.visibility = View.VISIBLE
                    holder.is_selected.isChecked = true
                    residentRecyclerViewListenerInterface.onResidentItemLongClickListener(holder.sl_no.text.toString().toInt(), posistion)

                }

                true -> {
                    // checked then unselect and remove from list
                    holder.resident_item_wrapper.setBackgroundColor(Color.WHITE)
                    holder.resident_vehicle_number.setTextColor(Color.BLACK)
                    holder.resident_model_name.setTextColor(Color.BLACK)
                    holder.is_selected.setBackgroundColor(Color.BLACK)
                    holder.is_selected.visibility = View.GONE
                    holder.is_selected.isChecked = false
                    residentRecyclerViewListenerInterface.onResidentItemLongUnselectClickListener(holder.sl_no.text.toString().toInt(),posistion)

                }
            }
            true
        }
    }
    interface ResidentRecyclerViewListenerInterface {
        fun onResidentItemLongClickListener(Id:Int, Position:Int)
        fun onResidentItemClickListener(Id:Int, Position: Int)
        fun onResidentItemLongUnselectClickListener(Id: Int, Position: Int)
    }

    class ResidentViewHolder(val view: View, residentRecyclerViewListenerInterface:ResidentRecyclerViewListenerInterface):RecyclerView.ViewHolder(view) {
        var vehicle_number:TextView
        var model_name:TextView
        var sl_no:TextView
        var resident_item_wrapper:CardView
        var is_selected:CheckBox
        var resident_vehicle_number:TextView
        var resident_model_name:TextView
        lateinit var residentRecyclerViewListenerInterface:ResidentRecyclerViewListenerInterface

        init {
            vehicle_number = view.resident_vehicle_number
            model_name = view.resident_model_name
            sl_no = view.resident_slno
            resident_item_wrapper = view.resident_item_wrapper
            is_selected = view.is_selected
            resident_vehicle_number = view.resident_vehicle_number
            resident_model_name = view.resident_model_name

        }
    }
}

Answer 1

试试这个:

在您的 POJO 类中获取一个 Boolean 变量

public class POJO {

    boolean isSelected;

    public boolean isSelected() {
        return isSelected;
    }

    public void setSelected(boolean selected) {
        isSelected = selected;
    }
}

在您的 onBindViewHolder() 方法中进行以下更改

 @Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

    if(pojoArrayList.get(position).isSelected()){
        // make selection in your item
    }else {
        //remove selction from you item
    }
}

现在在你的 onLongClickListener 中让你的选择为真

示例代码

    sampleButton.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View view) {

            // set the status of selection 
            pojoArrayList.get(position).setSelected(true);

            return true;
        }
    });

当你想删除选择时使用这个

  pojoArrayList.get(position).setSelected(false);

当你想从列表中删除项目时，使用 boolean 变量来删除项目

 if(pojoArrayList.get(position).isSelected()){
        //remove the item from list
       // and  notifyDataSetChanged(); after removing the item from list
 }